33. PITUOPHIS 737 
require recognition as a distinct subspecies, P. sayi affinis 
(Hallowell). 
Habits—Ruthven states that a large specimen, secured 
near Tucson about sun down on August 22, had recently 
swallowed an adult ground squirrel. These snakes live both 
on the desert plains near sea level and in mountain canyons 
to an altitude of at least 5,300 feet. 
164. Pituophis vertebralis (Blainville) 
San Lucan GopHER-SNAKE 
Coluber vertebralis Buatnvitte, Nouv. Ann. Mus. Hist. Nat., Vol. IV, 
1838, p. 293, pl. 27, figs. 2-2b (type locality, California); Barrp 
& Grrarp, Cat. N. Amer. Rept., Pt. I, Serp., 1853, p. 152. 
Pituophis vertebralis Dumérit et Bipron, Erpétologie Générale, Vol. 
VII, p. 238; Bocourt, Miss. Sci. au Mex., Reptiles, p. 672, pl. 
XLVI, figs. 1-1d; Van Densurcu, Proc. Cal. Acad. Sci., Ser. 2, 
Vol. V, p. 150; SteynecER & Barpour, Check List N. Amer. 
Amph. Rept., 1917, p. 86; Van Densurcu, Proc. Cal. Acad. Sci., 
Ser. 4, Vol. X, No. 1, 1920, p. 27; Van DenBurcH & S.evin, Proc. 
Cal. Acad. Sci., Ser. 4, Vol. XI, 1921, pp. 52, 67; Nexson, Mem. 
Nat. Acad. Sci., Vol. XVI, 1921, pp. 114, 115. 
Pityophis haematots Corr, Proc. Acad. Nat. Sci. Phila., 1860, p. 342 
(type locality, Cape St. Lucas). 
Pityophis vertebralis Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 3423 
Cops, Bull. U. S. Nat. Mus., No. 1, 1875, pp. 39, 92; YARROW, 
Bull. U. S. Nat. Mus., No. 24, p. 107; Garman, Bull. Essex Inst., 
Vol. XVI, 1884, p. 27; Cope, Bull. U. S. Nat. Mus. No. 32, 1887, 
p- 72; Betpinc, West Amer. Scientist, Vol. III, No. 24, p. 98; 
Corr, Proc. U. S. Nat. Mus., Vol. XIV, 1892, p. 642; Core, Report 
U. S. Nat. Mus. for 1898, 1900, p. 879; TerRon, Mem. y Rev. 
Soc. Cient. Antonio Alzate, Vol. 39, 1921, pp. 164, 170. 
Pityophis melanoleucus vertebralis Jan, Elenco sist. degli Ofidi, 1863, 
p- 59; Jan, Iconogr. génér. Oph., 22e livr., 1867, pl. 1, fig. 3. 
Pityophis catenifer Garman, Mem. Mus. Compr. Zool. Cambr., Vol. 
VIII, No. 3, 1883, pp. 52, 150 (part). 
